Walter ernest adeney and llewellyn



UNITED STATES PATENT OFFICE,

WALTER ERNEST ADENEY AND LLEW'ELLYN SAUNDERSON, OF KINGSTOWVN, COUNTY OF DUBLIN, IRELAND.

ARC-LIGHT CARBON,

SPECIFICATION forming part of Letters Patent No. 421,469, dated February 18, 18 90.

Application filed May 15, 1889. Serial No. 310,867. (No specimens.)

To all whom it may concern: ed, introduced into hot coal-tar, and the whole 50 Be it known that we, ALTER ERNEST heated for sometime, preferably in avacnum. ADENEY, residing at 20 Crosthwaite Park, The carbon rod is then taken from the coal- East Kingstown, county of Dublin, Ireland, tar, its surface cleaned, and again introduced and LLEWELLYN SAUNDEltS'ON, residing at into a mold and heated under pressure.

De Vesci Terrace, Kingstown, county of Dub- WVe claimlin, Ireland, subjects of the Queen of Great 1. The method, substantially as herein set Britain, jointly have invented certain new forth, of manufacturing electric-arc carbons, and useful Improvements in the Manufacture which consists in mixing together powdered 10 of Electric-Arc Oarbons, of which the followgas-coke, powdered coal, and an infusible or ing is a specification. difficultly fusible material, inserting; the mix- Our invention relates especially toimproveture in a mold, heating it under mechanical ments or modifications'of the composition of pressure, removing the carbon pencil thus carbons in order to improve the steadiness formed,immersing itin hot coal-tar and heat- I 5 and intensity of the electric-arc light and ing it, then taking it from the coal-tar and also to make the carbons more lastin cleaning its surface, and again introducing In order to carry out our invention, we it into a mold and heating it under mechanmanufacture carbons from a mixture of coke, ical pressure. coal, and an infusible or a difficultly fusible 2. The method, substantially as herein set 20 material by heating the mixture under prossforth, of manufacturing electric-arc carbons,

ure in a mold. which consists in mixing powdered gas-ooke, The subj cot-matter of our invention is spepowdered coal, and an infusible or difficultly cifically designated in the claims at the end fusible material, inserting the mixture in a of the specification. mold, heating it under mechanical pressure 25 The manner of manufacturing the carbons to form a carbon pencil, removing the penis as follows: Powdered gas-coke is mixed cil, immersing it in hot coal-tar, and then rewith powdered coal in the proportion of coke heating the pencil under mechanical pressure varying from eighty to fifty per cent, and in a mold. I that of coal varying from twenty to fifty per 3. The hereinbefore-dcscribedimprovement 30 cent. To this mixture is added one to ten in the manufacture of electric-arc carbons,

per cent. of infusible or difticultly fusible which consists in mixing powdered gas-coke, Substance, such as compounds of aluminum, powdered coal, and an infusible or difficultly silica, calcium, iron, &c., glass, cyanite, kaofusible material, forming this mixture in a lin,bauxite, asbestus, pumice, feldspar, gadolmold under heat and mechanical pressure 35 inite, samarskite, quartz, zircon, limestone, and immersing it in. hot coal-tar and reheatstrontianite, dolomite, withcrite, phosphate ing under mechanical pressure in a mold. S 5 of lime, braunite, titanic iron, chrome iron 4. A carbon for electric lights consisting of ore, Wolfram, molybdenite, fluorspar, cerite, a mixture of powdered gasnoke, powdered oryolite, phosphate of aluminum, magnesite, coal, and an infusible or difficultly fusible 40 or compounds of nickel and cobalt. These material in about the proportions specified refractory substances are used to render the impregnated with coal-tar and united under impurities in the coke and coal as difficultly heat and pressure.

,fusible as possible, and hence increase the \VALTER ERNEST ADENEY. v intensity and steadiness of the electric-arc LLEIVELLYN SAUNDERSON. 5 light and the durability of the carbon. After IVitnesses:

careful mixing the ingredients are introduced THOMAS TROY, into an iron mold and heated under pressure, 65 Lombard Street West, Dublin. first gently, but finally very strongly. The JOHN OONNOLLY, carbon rod thus made, if too porous, is heat- 36 Arnott St, Dublin. 

